I have a RSA signature S  (128 byte integer )
and modulus n (also 128 byte integer)

I need to calculate

( S**3 ) MOD n

All I need is to perform exponent ( S**3 ) and MOD operation on
128 byte integers.

I tried the following command:

openssl rsautl -in signature.bin -out decrsign.bin -inkey
RSAPubkey.pem -pubin  -decrypt

but got an error

A private key is need for this operation


Any idea how to decrypt this key ?


Andrus.

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